质量相等的两种相溶液体,密度分别为ρ1和ρ2,混合后密度为[ ]
A. ρ1+ρ2/2
B. 2ρ1×ρ2/(ρ1+ρ2)
C.ρ1×ρ1/(ρ1+ρ2)
D. ρ1+ρ2
答案:B
We won’t forget the financial crisis and the troubles _______ has caused to the people all over the world.
A.which
B.this
C.what
D.it
大宗交易纳入证券交易所即时行情和指数的计算,成交量在大宗交易结束后计入当日该证券成交总量。( )